[PSUBS-MAILIST] Underwater GPS using Underwater Backscatter Localization

[Alan via Personal_Submersibles]

Hi Ian,
I have something in infancy that involves surface data transducers sending down GPS
positions that are fed in to a standard sonar display that has maps on it. The kind that 
has a boat icon that moves & displays your path on the map.
Alan

> On 9/11/2020, at 10:42 AM, irox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Hi Alan, 
> 
> yeah that's probably one of the best option for open source sonar.  I'm hoping that I can install the
> Blue Robotics 360 scanner on Gamma at some point, then feed that into some SLAM (Simultaneous
> Localization And Mapping) type program/module(s) to generate a map and locate the sub in the map.
> It doesn't help with the absolute/global position, but may be useful for in-situ use and after the
> fact analysis.
> 
> Cheers,
>   Ian.
> 
> 
> -----Original Message----- 
> From: Alan via Personal_Submersibles 
> Sent: Nov 8, 2020 12:19 PM 
> To: Personal Submersibles General Discussion 
> Subject: Re: [PSUBS-MAILIST] Underwater GPS using Underwater Backscatter	Localization 
> 
> Thanks Ian,
> there is this Blue Robotics Sonar imaging scanner that has open source software.
> https://bluerobotics.com/store/sensors-sonars-cameras/sonar/ping360-sonar-r1-rp/
> Alan
> 
>> On 9/11/2020, at 8:36 AM, irox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> 
>> MIT has published a paper on underwater positioning using Underwater Backscatter Localization which
>> might be of interest to some folks on the list.
>> 
>> Although it seems more focused on positioning of un-powered or under-powered objects (fish, drones, etc
>> - surface vessel knowing the position of an underwater object), and it's only a proof-of-concept
>>  (the paper on covers 1D positioning, we'd really need 3D), it does offer some hope for a relatively cheap
>> underwater positioning system in the future.
>> 
>> The paper can be found here:
>> http://www.mit.edu/~fadel/papers/UBL-paper.pdf
>> 
>> There is a kind of layman's summary here:
>> https://hackaday.com/2020/11/08/under-the-sea-gps-uses-sound/
>> 
>> Pity there isn't a a cheap sonar "hackers" kits (although some have do things with PC sound cards).
>> On the radio side of things I can take a USB SDR (Software Defined Radio) and build a radio telescope
>> for well under $100 (actually, I think it was under $50 in the end), would be great to be able to have
>> that flexibility for playing with sonar.
>> 
>> Cheers,
>>   Ian.
>> 
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